this morning we learned much more about the tragedy that unfolded yesterday in newtown, connecticut. 20 children and six adults gunned down inside an elementary school. we have the latest timeline. at 9:30 a.m., classes begin at sandy hook, the safe top schools. some teachers and faculty were gathered in the main office for a meeting. five minutes later they hear gunshots and duck. >> the principal, pictured right here, and also a school psychologist, confronted the gunman and become the shooter's first victim. the principal likely saved many likes there by turn on the school loudspeaker so that everyone could hear and that everyone could take cover in that school. shortly after, the first 9-1-1 calls started. police arrived in minutes. at 10:23 they entered the school and confirm that shooter is dead and they start moving children from harm's way. frantic parents and loved ones started to rush to the scene and later that day after we realize the magnitude of the shooting, at 3:17, president obama talking about this as he wives away his own tears addressing the nation. >> an entire c